Abstract
In this Chapter we discuss three important issues. The first is how \(\mathrm{i} = \sqrt{-1}\) makes its appearance in classical electrodynamics and in Dirac theory. This issue is important because if someone did not really know the real meaning uncovered by \(\mathrm{i} = \sqrt{-1}\) in these theories he may infers nonsequitur results. After that we present some ‘Dirac like’ representations of Maxwell equations. Within the Clifford bundle it becomes obvious why there are so many ‘Dirac like’ representations of Maxwell equations. The third issue discussed in this chapter are the mathematical Maxwell-Dirac equivalences of the first and second kinds and the relation of these mathematical equivalences with Seiberg-Witten equations in Minkowski spacetime \((M,\boldsymbol{\eta },D,\tau _{\boldsymbol{\eta }},\uparrow )\) which is the arena where we suppose physical phenomena to take place in this chapter. We denote by {x μ} coordinates in Einstein-Lorentz-Poincaré gauge associated to an inertial reference frame \(\boldsymbol{e}_{0} \in \sec TM\). Moreover \(\{\boldsymbol{e}_{\mu } = \frac{\partial } {\partial x^{\mu }}\} \in \sec TM,(\mu = 0,1,2,3)\) is an orthonormal basis, with \(\boldsymbol{\eta }(\boldsymbol{e}_{\mu },\boldsymbol{e}_{\nu }) =\eta _{\mu \nu } =\mathrm{ diag}(1,-1,-1,-1)\) and \(\{\gamma ^{\nu } = dx^{\nu }\} \in \sec \bigwedge ^{1}T^{{\ast}}M\hookrightarrow \sec \mathcal{C}\ell(M,\eta )\) is the dual basis of \(\{\boldsymbol{e}_{\mu }\}\).
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Notes
- 1.
Recall that \(\boldsymbol{\partial }^{(s)} =\boldsymbol{\varepsilon } ^{\mathbf{a}}\boldsymbol{\nabla }_{\mathbf{e}_{\mathbf{a}}}^{(s)}\) is the representative of the spin-Dirac operator in the Clifford bundle.
- 2.
For the moment different helicities means that the vectors \(\vec{A}^{(i)}\) have opposite sense of rotation. We will be more precise later.
- 3.
Recall that \(\mathcal{I}(M,\eta )\) is a bundle of amorphous spinor fields and it is not to be confused with the bundle I(M, η) (Definition 7.16) of algebraic spinor fields.
- 4.
Spin\(_{3} \simeq \mathrm{ SU(2)}\).
- 5.
Recall that \(\vec{\rho }\) is an unitary vector.
- 6.
- 7.
In Silverman’s book his Eq. (34), pp.167 is the one that corresponds to our Eq. (13.32).
- 8.
- 9.
- 10.
We are using s system of units such that c = 1.
- 11.
Of course, it is necessary for the quantum mechanical interpretation to multiply both sides of Eq. (13.66) by \(\hslash \), the Planck constant.
- 12.
Indeed in quantum mechanics the Pauli matrices \(\boldsymbol{\sigma }_{i}\) and the matrices K i are the quantum mechanical spin operators and
$$\displaystyle{\sum _{i=1}^{3}(\boldsymbol{\sigma }_{ i})^{2} = \frac{1} {2}(1 + \frac{1} {2}) = \frac{3} {4},\text{ }\sum _{i=1}^{3}(\mathbf{K}_{ i})^{2} = 1.(1 + 1) = 2.}$$.
- 13.
- 14.
This object first appears for the best of our knowledge in [45].
- 15.
The question of the physical dimensions of the Dirac-Hestenes and Maxwell fields is discussed in [36].
- 16.
Lochak suggested that an equation equivalent to Eq. (13.174) describe massless monopoles of opposite ‘charges’.
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Rodrigues, W.A., Capelas de Oliveira, E. (2016). Maxwell, Dirac and Seiberg-Witten Equations. In: The Many Faces of Maxwell, Dirac and Einstein Equations. Lecture Notes in Physics, vol 922. Springer, Cham. https://doi.org/10.1007/978-3-319-27637-3_13
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